Assiglstoe of one-half



(No Model.) 4

. R. D. THACKSTON.

SELF CLOSING HATGHWAY.

No. 311,091. Patented Jan. 20, 188.5.

` UNITED STATES PATENT OFFICE.

RICHARD D. THACKS'ION, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF rroHENRY I. ooE,

` OF SAME PLAGE.

SELF-CLOSING HATCHWAY.'u

SPECIFICATION forming an elevator; and Fig. 2 is a perspective view ofthe upper part ofthe cage.

This invention relates to an improvement in self-closing hatchways, moreparticularly intended for fast-running elevators.

This invention consists in a spring of such a 'form and secured to thecam in such a manner that should it be broken the cani will stillcontinue to do the Work of opening the door, as more fully describedhereinafter.

Referring to the drawings, A represents part of the uprights; B, thedoors; C, part of the cage; and D, the cams secured to the cage foropening the doors. I have shown two doors and consequently two cams; butone of each Application filed June G, 1F84. (No model.)

part of Letters Patent'No. 311,091, dated January 2o, 1885.

could be used. Secured to each cam is a spring, J, that comes againstthe door in advance ofthe cain,to prevent a too sudden opening of thedoor, ,thereby avoiding noise a'nd injury to the door. The springpreferably consists of a flat piece of spring` metal, and is so securedto the cam that should it be broken, the cam will not be affectedthereby, but will continue to do its work in opening the door, thusavoiding all danger of loss ot' time arising from broken springs andalso all danger incident thereto.

I claim as my invention- 1. In a selfclosing hatchway,incombination witha cam for opening the door, the spring connected to the cam in advancethereof, as and for the purpose set forth.

2. In a self-closing hatchway, in combination with a cam for opening thedoor, the itlat metal spring J, secured to the cam, to strike the doorin advance thereof, as set forth.

RICHARD D. THACKSTON.

In presence of- GEo. I-I. KNIGHT, SAME. KNIGHT.

